NO. 1863 BIBLIOGRAPHY OF CANAL RAYS — FULCHER 305 



In general. Weak effect compared with that of cathode rays: Ew3(302). 

 Temporary effect, soon dying down, but may be revived by heating: 



An (326). 

 Color depends on gas filling, very sensitive to impurities : 

 W5(524, 253) ; W6(589). Also depends on glass: 

 W5(S25, 256). 

 Differences persist even for very low pressures, hence are not due 

 to differences of absorption: W6(S9o). 

 Spectrum is always a line spectrum: Ew3(302). 

 Strongest fluorescence in the case of H: W4(43S), cf. 03(210). 

 Sodium light appears inside of glass wall and is easily distinguishable 

 from cathode ray fluorescence: G4; V3(iS) ; Ew3(302). 

 On Metals and Metallic Salts. 



Cobalt, Manganese, Mercury, Nickel, and Thallium Salts show no fluo- 

 rescence: An (326); Sm2(7o6). 

 Solid solutions: See An (326) ; Sm2(7o6, 708). 

 Aluminum. Polished metal shows no fluorescence : W7. 

 Oxide. Pure AI2O3 does not fluoresce: Sm3(625). 



One part in 10,000 of chrome oxide causes bright red fluor- 

 escence: Sm3(625) ; Ew3(304). A trace of CuO causes 

 weak green fluorescence, which becomes bluish and then 

 blue as more CuO is added: Sm3(626) ; Cf. W7; S4(649). 

 Cadmium salts show yellow fluorescence: An (326) ; Sm2(7o6). 



Oxide. Weak greenish fluorescence in H= or O2 : W7; S4(649). 

 Calcium salts. White fluorescence: Ari(326). Bluish; Sm2(7o6). 

 Caesium salts show bright blue fluorescence: Tri(i42). 

 Copper oxide. No fluorescence in O2 or H2 : W7. 

 Iron salts. No fluorescence: Ari(326); Sm2(7o6). 



Oxide. No fluorescence : W7. ' 

 Lithium. Salts show weak red fluorescence: An (326); 06(229); 

 Tri(i4i) ; Tm3(ioi7). Chloride becomes black in H2: 

 Tri(i4i). 

 Magnesium. Salts show green fluorescence, line spectrum: 06(229). 



Oxide obtained bv burning Mg shows red fluorescence in O2 or H2 : 



W7;"S4(649). 

 Fluorescence probably due to an oxide impurity held in solid 

 solution: Sm3(633). 

 Potassium. Pure metal shows no fluorescence: Tm3(ioi7). 

 Rubidium salts show red and blue fluorescence: Tr 1(142). 

 Sodium. Pure metal shows no fluorescence: Tm2(2i4) ; Tm3(ioi7). 

 Sodium glass. Oold yellow fluorescence, D-line : O4; 06(229). 

 " oxide. Oreenish yellow: Tm2(2i4). 



" salts. Red yellow, D-line, no noticeable discoloration of 

 salts: An(326); Sm2(705). 

 Strontium salts. Rose-white fluorescence: An (326). 

 Zinc. Salts show green fluorescence: An (326). 



Willemite dusted on glass fluoresces brightly, especially in H2 : 

 Tm3(562, 570). 



